A Feedrate-Constraint Method for Continuous Small Line Segments in CNC Machining Based on Nominal Acceleration Article Swipe
Peng Guo
,
Ronghua Wang
,
Zhebin Shen
,
Haorong Zhang
,
Peng Zhang
,
Fei Lou
,
Hengbo Li
,
Yijie Wu
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.3390/app11198837
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.3390/app11198837
When the CNC machining of continuous small line segments is performed, the direction of the machine tool movement will change abruptly at the corner of adjacent line segments. Therefore, a reasonable constraint on the feedrate at the corner is the prerequisite for achieving high-speed and high-precision machining. To achieve this goal, a feedrate-constraint method based on the nominal acceleration was proposed. The proposed method obtains the predicted value of acceleration during the machining process by the machining trajectory prediction and acceleration filtering. Then, the feedrate at the corner is constrained, according to the predicted acceleration. Specifically, for any corner of adjacent line segments, the proposed method assumes that the CNC machining of a short path centered on the corner is carried out at a constant feedrate. First, the actual machining trajectory is predicted according to the transfer function of the servo system. Then, the nominal acceleration, when the CNC machining is carried out to the corner, is calculated and processed by a low-pass FIR filter. Last, the feedrate-constraint value at the corner is obtained according to the nominal acceleration and the preset normal acceleration. The advantage of the proposed method is that it can be used for different machining paths consisting of long segments or continuous small segments and it has no special requirement for the accuracy of the machining path. As a result, the feedrate-constraint value obtained is reasonable and the smooth machining process can be ensured. The simulation results in both 2D and 3D machining paths show that the proposed method is insensitive to the length of the line segment and the angle of the corner, and the calculated feedrate-constraint value is close to the theoretical value, which has good stability and versatility. In contrast, the feedrate-constraint values obtained by conventional methods change abruptly along the machining path, especially in the 3D simulation, which will damage the machining quality. The experiment was performed on a three-axis CNC machine tool controlled by a self-developed controller, and a free-form surface workpiece was machined by a conventional feedrate-constraint method and the proposed method, respectively. The experimental results showed that the proposed method can make the feedrate of the machining process higher and more stable. Then, machining defects such as overcutting and undercutting can be avoided and the machining quality can be improved. Therefore, the article proposes a new method to constrain the feedrate at the corner of continuous small line segments, which can improve the machining efficiency and quality of the CNC machining.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/app11198837
- https://www.mdpi.com/2076-3417/11/19/8837/pdf?version=1632391955
- OA Status
- gold
- Cited By
- 2
- References
- 36
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W3204372863
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
-
https://openalex.org/W3204372863Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.3390/app11198837Digital Object Identifier
- Title
-
A Feedrate-Constraint Method for Continuous Small Line Segments in CNC Machining Based on Nominal AccelerationWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2021Year of publication
- Publication date
-
2021-09-23Full publication date if available
- Authors
-
Peng Guo, Ronghua Wang, Zhebin Shen, Haorong Zhang, Peng Zhang, Fei Lou, Hengbo Li, Yijie WuList of authors in order
- Landing page
-
https://doi.org/10.3390/app11198837Publisher landing page
- PDF URL
-
https://www.mdpi.com/2076-3417/11/19/8837/pdf?version=1632391955Direct link to full text PDF
- Open access
-
YesWhether a free full text is available
- OA status
-
goldOpen access status per OpenAlex
- OA URL
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https://www.mdpi.com/2076-3417/11/19/8837/pdf?version=1632391955Direct OA link when available
- Concepts
-
Machining, Acceleration, Numerical control, Constraint (computer-aided design), Trajectory, Engineering, Control theory (sociology), Process (computing), Machine tool, Mechanical engineering, Computer science, Physics, Artificial intelligence, Control (management), Astronomy, Classical mechanics, Operating systemTop concepts (fields/topics) attached by OpenAlex
- Cited by
-
2Total citation count in OpenAlex
- Citations by year (recent)
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2024: 1, 2022: 1Per-year citation counts (last 5 years)
- References (count)
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36Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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